An interface for changing the focus of the driver to another frame or window.
defaultContent()code »
Schedules a command to switch focus of all future commands to the first frame
on the page.
frame(nameOrIndex)code »
Schedules a command to switch the focus of all future commands to another
frame on the page.
If the frame is specified by a number, the command will switch to the frame
by its (zero-based) index into
window.frames.
If the frame is specified by a string, the command will select the frame by
its name or ID. To select sub-frames, simply separate the frame names/IDs by
dots. As an example, "main.child" will select the frame with the name "main"
and then its child "child".
If the specified frame can not be found, the deferred result will errback
with a bot.ErrorCode.NO_SUCH_FRAME
error.